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Discussion Starter · #1 ·
So I just picked up a 2016 CCLB diesel and after bringing it home its started having a shudder when shifting at low RPM. I've read some have been able to fix this issue with a fluid swap, and others say the torque converter needs replaced but all these threads are relatively old. Has there been anything recent that states which route I should try first?
 

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Congrats on the Truck and welcome.

Replace the fluid first as it's way cheaper.

Use the Mobile1 HP LV BLUE label fluid as that's what GM has been using on both the 8 speeds and the 6L50's as well. If this doesn't solve your problem then it's most likely time for a torque converter. The thing is don't wait to long as the shutter is abusing the lock-up clutch and friction surface. The longer you let it slip the more it will damage the surfaces and consequently the more the probability a replacement TC will be needed.



Lets us know how you make out, Good Luck
Shop the price, I see if moving regularly from mid $40 all the way up to $60 a case.
 

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9029
 

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Awesome! I just purchased 12 quarts of the trans fluid and 12 quarts of the Mobil 1 gear oil to change the diff oil. I will be changing the trans, transfer case, and front and rear diff oil out. The extra diff oil will go in another one of my vehicles and I added a quart of redline mtl for my old Land Rover gearbox. That got me to the $150 free shipping point.
 

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Awesome! I just purchased 12 quarts of the trans fluid and 12 quarts of the Mobil 1 gear oil to change the diff oil. I will be changing the trans, transfer case, and front and rear diff oil out. The extra diff oil will go in another one of my vehicles and I added a quart of redline mtl for my old Land Rover gearbox. That got me to the $150 free shipping point.
Make sure the gear oil does not have any friction modifiers if you have the Eaton G-80 rear locking differential. If you have the G-80 is will stop it from locking up properly.
 

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thanks for the link, just purchased 12 qts myself. I have 2 local stores and neither had in stock.
so they ordered it for me with free shipping to my house... gotta love Jegs..
Mine won’t ship until the 22nd. Seems as if the sale is going well.
 

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So I just picked up a 2016 CCLB diesel and after bringing it home its started having a shudder when shifting at low RPM. I've read some have been able to fix this issue with a fluid swap, and others say the torque converter needs replaced but all these threads are relatively old. Has there been anything recent that states which route I should try first?
Fluid fixed mine
 

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So I just picked up a 2016 CCLB diesel and after bringing it home its started having a shudder when shifting at low RPM. I've read some have been able to fix this issue with a fluid swap, and others say the torque converter needs replaced but all these threads are relatively old. Has there been anything recent that states which route I should try first?
I have had a shudder in mine since like 60000 miles I have 120000 on it now I figure I’ll drive it till the tranny quits then replace the tranny
 

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So I just picked up a 2016 CCLB diesel and after bringing it home its started having a shudder when shifting at low RPM. I've read some have been able to fix this issue with a fluid swap, and others say the torque converter needs replaced but all these threads are relatively old. Has there been anything recent that states which route I should try first?
I had that problem also but it was with a 2018 gas engine with the eight speed transmission. At 1000 miles they did a triple flush on the transmission that took care of it till 15,000 miles when it started vibrating again. This time they said it needed a torque converter. I went to another dealership and traded it for a 2019 Zr2 with the diesel and a 6 speed transmission and haven’t had a single issue.
 

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Discussion Starter · #12 ·
So update time: I had a bit of free time this week and the shudder had gotten worse before I flushed the transmission so I took it to the dealer. They (luckily) were really quick and are replacing the torque converter this week. I plan to run a better fluid (like the Mobil 1 HP) in the future, does anyone else have tips on how to prevent needing another torque converter In the future?
 

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Did the dealer do a fluid flush with the converter replacement ? If not I would do it with the (blue label, mobile HP LV fluid) right away because that's been the part of the root cause of the issue. If you feel it start shuttering keep it from doing it by changing throttle position and get it back to the dealer ASAP. The longer it shutters the more it beats up on the friction surfaces in the TC.
 

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Discussion Starter · #14 ·
They drained the transmission but when they refilled it they just used their standard ATF. I plan on flushing it and using the Mobil 1 black label shortly.
 

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They drained the transmission but when they refilled it they just used their standard ATF. I plan on flushing it and using the Mobil 1 black label shortly.
The mobile blue label is what they are using now. They started with the black label and abandoned it for the blue because the black label wasn't resolving the issue.
 

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2016 Z71 CCSB 2.8 Diesel
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So I just picked up a 2016 CCLB diesel and after bringing it home its started having a shudder when shifting at low RPM. I've read some have been able to fix this issue with a fluid swap, and others say the torque converter needs replaced but all these threads are relatively old. Has there been anything recent that states which route I should try first?
How many miles on it when you bought it? Curious because I just took a 2016 CCSB diesel home today with 66k on it and noticed a shudder on the highway on the way home ....
 

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Is this shuddering issue, that is the topic in so many threads, evidencing itself at road speed or at idle? After a long run towing at road speed (65 mph), I can get what appears to be a 25-50 rpm idle drop and a slight bit of rough idle. At road speed, it runs very smooth. Later on all is back to 'normal'.

42,000 mi and the transmission was flushed with GM spec full synthetic at 7,000 mi along with all the other gear fluids as a "just in case" protective measure!
 

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Congrats on the Truck and welcome.

Replace the fluid first as it's way cheaper.

Use the Mobile1 HP LV BLUE label fluid as that's what GM has been using on both the 8 speeds and the 6L50's as well. If this doesn't solve your problem then it's most likely time for a torque converter. The thing is don't wait to long as the shutter is abusing the lock-up clutch and friction surface. The longer you let it slip the more it will damage the surfaces and consequently the more the probability a replacement TC will be needed.



Lets us know how you make out, Good Luck
Shop the price, I see if moving regularly from mid $40 all the way up to $60 a case.
My 2017 when I bought it earlier this year had to have it changed from the dealer I bought it from. I have a good friend that works for Chevy and says it's a common issue with the torque converter going bad
 

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I’m just under 50,000 miles. 12,000 of that has been towing. Some of the towing could be considered under extreme conditions, through mountain passes and such with over 6000 pounds. As a precaution, I replaced the fluid with the mobil 1 blue label at 42,000 just before the most extreme towing i have done. I also put the larger PML fluid pan in. I haven’t noticed any shudder issues. I do get an occasional hard up shift on light throttle.

I initially thought I had a shudder when towing but it was, lol, driving over raised lane dividing markers. It was when passing so I thought it was caused by acceleration. I was out of state and hadn’t experience them previously. We don’t have those in Missouri.

As a side note, I had some difficulty getting the fluid level right with PML pan. It never slowed to a drip like the GM pan. After a lot of trial and error I think I got it right. Frankly, I wish PML had just duplicated the fill check portion of the GM pan.
 
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